Definition of: bitumen

(bi·t′mən, -ty′-, bich′·mən)noun1. Any native mixture of solid and semi-solid hydrocarbons, as naphtha or asphalt.2. A brown paint made by mixing asphalt with a drying oil: used by artists.[<L]—bi·tu·mi·noid (bi·t′mə·noid, -ty′-) adjective